Seal for gyratory crushers



SePf- 20, 1966 H. BALMER ETAL 3,273,808

SEAL FOR GYRATORY CRUSHERS Original Filed Nov. 14, 1961 2 Sheets-Sheet lwwf WM Sept 20, 1966 H. BALMER ETAL 3,273,868

SEAL FOR GYRATORY CRUSHERS Original Filed Nov. 14. 1961 2 Sheets-Sheet:2

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/ zi? @if M ai zia y /Z M y United States Patent O 3,273,808 SEAL FRGYRATRY CRUSHERS Hansjrg Balmer, Langenthal Bern, Switzerland, andRudolph J. Gasparac, Milwaukee, Wis., assignors to NordbergManufacturing Company, Milwaukee, Wis., a corporation of WisconsinOriginal application Nov. 14, 1961, Ser. No. 152,222, now Patent No.3,140,839, dated .luly 14, 1965. Divided and this application Apr. 8,1964, Ser. No. 358,264 4 Claims. (Cl. 241-21S) This is a division ofSerial No. 152,222 filed November 14, 1961, now U.S. Patent No.3,140,839.

This invention is i-n the lield of material reduction machines and isconcerned, among other things, with an improved gyratory crusher.

A primary object of the invention is an improved gyratory crusher whichis eliicient in use.

Another object is a gyratory Crusher with an improved sealingarrangement to keep dust and dirt out of the bowl `threads which reducesthe height of the Crusher significantly.

Other objects will appear from time to time in the ensuing speci-cationand drawings in which:

FIGURE l is a vertical section of a gyratory Crusher; and

FIGURE 2 is a portion of FIGURE l, on an enlarged scale.

In FIGURE l, a crusher has been shown generally including the followingmain parts, a main frame A which supports a bowl structure B releasablyheld on the main frame by a release mechanism C and arranged to beadjusted by an adjustment mechanism D. The main frame `also supports acrushing head E defining a crushing cavity with the bowl.

The main frame A includes a base flange with an upstanding housing 12and a supporting iiange 14 for the bowl structure at the upper end. Thebase flange is connected to a center hub 16 by a web structure 18. Thecenter hub supports an eccentric 20 which has .a suitable counterweight22 at its upper end overhanging the upper end of the center hub andconnected to a ring gear 23 by bolts 24 o-r the like, which in turn isdriven by a pinion 25 on a drive shaft 26 which in turn may be driven bya belt and pulley arrangement or any suitable means, not shown.

The bowl structure B may include an adjustment or tilting ring 100screwthreaded as at 102 to a bowl 104.

The bot-tom of the threads between the bowl and adjustment ring may beclosed by a seal 234, which has a continuous annular sealing member withinner and outer lips 236 and 238 attached to the lower end of theadjustment ring. An outer cylindrical surface 239 in the form of adepending shield or plate 240 attached to -the adjustment ring may beopposite the outer lip of the sealing member and the bowl may have aninner cylindrical surface 242 extending upwardly from its lower edge tothe point where the bowl thread starts. The adjustment ring may have aplurality of sockets 244 at suitable intervals .around the Crusher witha rod 246, each surrounded by a coil spring 248 or the like. The coilspring is supported on a ring 249 held in place by a snap ring so thatthe springs force the rods up, thereby keeping lthe sea] against thebottom of the adjustment ring. However, as the liner and mantle wearaway and the bowl is adjusted do-wn, the bottom 250 of the bowl threadswill contact the sealing member 234 about half way down. Fur-theradjustment of the bowl down will push the seal down compressing thesprings 248. When the mantle and liner `are sufficiently worn that theymust be replaced, the bowl is turned |back up and the springs cause theseal to follow until the seal hits the bottom of the adjustment ring.During approximately the 3,273,808 Patented Sept. 20, 1966 ice firsthalf of bowl adjustment down, the inner lip 236 of the seal wipesagainst the bowl surface 242, and during approximately the second halfthe outer lip 238 wipes against the adjustment ring surface 239. Thearrangement shown has the advantage that the rods and springs are upinside the adjustment ring and will not be clogged by dirt, dust andmoisture.

It will be realized that whereas a practical and operative device hasbeen described and claimed, nevertheless many changes may be made in thesize, shape, number and disposition and relation o-f parts withoutdeparting from the spirit of the invention. It is therefore wished thatthe description and drawings be taken as in `a broad sense illustrativeor diagrammatic rather than as limiting to the precise showing.

The use, operaiton and function of the invention are as follows:

In prior gryatory Crushers, the botto-m of 4the threads between theadjustment ring and bowl have been sealed by a simple wiping contactseal. The seal previously had to be as long as the total travel of thehead from the time new manganese was installed until it was completelyworn out and needed replacing. In large Crushers, this could be asubstantial distance. Further, the threads between the adjustment ringand bowl had. to have a certain minimum engagement at each end oftravel, for example two full turns or threads engaged. Since the bottomseal for these threads had to clear in all positions, the head height ofthe crusher was necessarily increased.

The present seal has the advantage that it travels with the bowl duringapproximately one-half of the bowl movement during adjustment. In FIGURE2, for example, the bowl may be considered to be in its maximum raisedposition with new manganese in place. The seal 234 stays in the positionshown until, due to manganese wear, the bowl has been turned down towhere the bottom 250 of the bowl threads contact the seal. Thereafter,as the bowl is turned down during adjustment for further manganese wear,the seal 234 will ride down with the bowl.

During the rst portion, the inner lip 236 slides against surface 242.During the second portion., the outer lip 238 slides along surface 239.

The springs should be constructed to force the seal up with sufficientthrust to overcome gravity and the down friction of the bowl. Thearrangement has the additional advantage that the springs are totallyenclosed in the adjustment ring behind and fully protected by the sealitself. Thus, no dirt, dust and foreign matter from the crushingopera-tion can clog or jam the springs or the rods that hold thesprings.

We claim:

1. In a gyratory Crusher, a main frame, a gyratory head positioned inthe main frame, a bowl mounted in the main frame defining a crushingcavity with the head and constructed to be adjusted vertically to varythe size of the crushing cavity, .and a seal between the bowl and mainframe including generally concentric cylindrical surfaces on the bowland main frame, a seal ring between the surfaces bearing on each andconnected to one, means for biasing the seal ring toward one extremeposition of movement, and means for engaging the seal after apredetermined amount of adjustment of the bowl to overcome the biasingmeans so that the seal ring thereafter moves with the bowl.

2. The structure of claim 1 further characterized by .and including anadjustment ring yieldably mounted on the main frame, the bowl beingscrew threaded i-nto the adjustment ring, the seal ring being effectivebetween the bowl and adjustment ring.

3. The structure of claim 2 further characterized in that the seal ringis held against the adjustment ring by ing below the normal position ofthe seal ring such that 5 during approximately the first half of rotaryadjustment of the bowl, the inner portion of the seal ring will bear andslide against the concentric surface on the bowl, and duringapproximately the second half of bowl adjustment, the

bottom of the bowl threads will engage the seal ring land lo force itdown, compressing the springs, with the outside of the seal ring bearingand sliding against the concentric surface on the adjustment ring.

4. The structure of claim 3 further characterized in that the springsare mounted in sockets in the adjustment ring such that when the sealring is in its upper position, it fully protects the springs by sealingContact with the concentric surfaces.

References Cited by the Examiner UNITED STATES PATENTS 3,009,660 11/1961Symons et al 241-290 ROBERT C. RIORDON, Primary Examiner.

H. F. PEPPER, JR., Assistant Examiner.

1. IN A GYRATORY CRUSHER, A MAIN FRAME, A GYRATORY HEAD POSITIONED INTHE MAIN FRAME, A BOWL MOUNTED IN THE MAIN FRAME DEFINING A CRUSHINGCAVITY WITH THE HEAD AND CONSTRUCTED TO BE ADJUSTED VERTICALLY TO VARYTHE SIZE OF THE CRUSHING CAVITY, AND A SEAL BETWEEN THE BOWL AND MAINFRAME INCLUDING GENERALLY CONCENTRIC CYLINDRICAL SURFACES ON THE BOWLAND MAIN FRAME, A SEAL RING BETWEEN THE SURFACES BEARING ON EACH ANDCONNECTED TO ONE, MEANS FOR BIASING THE SEAL RING TOWARD ONE EXTREMEPOSITION OF MOVE-